---You were out when I dropped in at your house.
--- Oh, I ____ for a friend from England at the airport.
| A．was waiting | B．had waited |
| C．am waiting | D．have waited |
Should development be stopped________________nature?
| A．in honor of | B．in search of | C．in favor of | D．in memory of |
There is no doubt _________ the world climate has been changing in recent years.
| A．that | B．what | C．if | D．whether |
Much to the couple’s comfort, their income is now double ________ it was five years ago.
| A．that | B．than | C．which | D．what |
Bruce Lee came to America with the ________ of realizing his dream.
| A．attention | B．intention | C．expectation | D．desire |
_________ is a growing world problem, and nowadays the United Nations and its member countries _________hard to deal with it．
| A．Desertification; are working | B．Desertified ; worked |
| C．Desert; work | D．Desertification; have worked |